John daniel price



(No Model.)

J. D. PRICE.

METALLIC PACKING POR PISTONS.

@50i/imaxes Patented Aug. 18, 1891.

UNITED STATES PATENT OFFICE.

JOHN DANIEL PRICE, OF PUEBLO, COLORADO, ASSIGNOR OE ONE-THIRD TO THOMAS II. PRICE, OF SAME PLACE.

METALLIC PACKING FOR PISTONS.

SPECIFICATION forming part of Letters Patent No. 458,130, dated August 18, 1891.

Application filed April 7, 1891. Serial No. 387,955. (No model.) I

To aZZ whom, it may concern: i

Be it known that I, JOHN DANIEL PRICE, of

` the city of Pueblo, Pueblo county, State of Colorado, have invented certain new and useful Improvements in a Metallic Packing for Hydraulic Piston-Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates t-o improvements in pistons; and it consists in the novel arrangement and combination of parts, as will be more fully hereinafter described, and designated in the claims.

In the drawings, Figure l is a Vertical section of my complete invention. Fig. 2 is a side elevation of the same, showing the parts detached. Fig. 3 isahorizontal cross-section taken on .the line :c of Fig. l. Fig. 4 is a side elevation of a modification of my invention. Fig. 5 is a top plan view of the same, and Fig. 6 is a vertical section of a composition cup which I employ in carrying out my invention.

My invention is especially adapted to be used in connection with hydraulic cylinders. However, its use Inay be extended without materially parting from the true nature o the same.

Referring to the drawings, l indicates a cylinder, and 2 the piston itself, which is constructed as follows, to wit:

3 indicates a metallic cup, the same being preferably stamped out of a disk of metal. Said cup is provided with a series of slits 4, so as to render the same expansive under heavy pressure. 5 indicates a similar cup, which is provided with a series of slits 6. Said cup is also provided with an outward iiange 7, the length of the same being about equal to the thicknessI of cup 3 and in its normal position overlies cup 3, as shown in Fig. l. The slits 6 formed in said cup are to render the same susceptible to expansion under heavy pressure. Interposed between said cups 3 and 5 is la stratum of impermeable material 8, such as india-rubber, the same being adapted to effect a water-tight structure. The cups are so constructed relative to the slits that the joints can be broken when 5o the same are put together in their normal position, thereby making a perfectly tight and expansible piston. Said cups 5 and 3, and also the stratum of impermeable material S, are provided with a perforation in which the piston-rod may be inserted and secured, as shown in Fig. l, in which ligure it can be readily perceived that the piston-rod 9 is Iirmly secured to the piston 2 by Ineans of nuts 10. Interposed between the same is the 6o piston itself. The cups 3 and 5, as well as the impermeable stratum 8, are firmly secured together by means of rivets ll, as shown in Fig. l.

Referring to the modification as shown in Figs. 4, 5, and 6, in place of using two metallic cups, as in the first-mentioned construction, I substitute in lieu of cup 5 a colnposition cup l2, the same being composed of a mixture of gutta-perchaand copperiilings. This mix- 7o ture, of course, will form an impermeable cup, and when used in connection with cup 3 will form a perfectly water-tight and expansible piston without the agency of the impermeable stratum 8. Cup l2 is provided 75 with a circular flange 13, the extent of the same being somewhat less than the thickness of cup 3, so that when they are put together in their normal position the composition cup 12, or especially the flange 13 of the same, 8o will not be subjected to the abrasive effect consequent to the functional operation of the piston.

Havingvfully described my invention, what I claim is- 8 5 l. In a piston, a metallic cup 3, provided with slits et in the sides thereof, a second cup 5, having similar slits 6, an outwardly-proj ecting flange 7 thereon, a packing of impermeable material between said cups, rivets 9o passing through the cups and packing to hold the same together, a piston rod passing through central apertures in the cups,` and nuts l0 screwed on said rod, one above and the other below said piston, substantially as described.

2. In a piston, a metallic cup provided with slits in the sides thereof, an outwardly-projeeting Ilange thereon, un impermeable conione above mld the other below the piston,

position onp of gntta-peroha. and copper lIllsubstantially as described. 1o

ings located within said ,first-mentioned cup, In testimony whereof I aflix my signature a flange ou said composition cup, the dimnin presence of two witnesses.

5 eter of which cup, including its lianges, is JOHN DANIEL PRICE.

less than the diameter of the metallic cup and Vitxlesses: fiange, :L piston-rod passing through the oen- J. A. STAFFORD, ter of Suid oups, and nuts screwed thereon, JNO. LYELL. 

